A cartoon insert in several national newspapers explains international trade for kids.

WASHINGTON (CNN) - There’s nothing funny about the Colombia free trade agreement, a hotly contested issue on the 2008 election campaign trail and throughout the halls of Congress. But the White House is now sticking up for the beleaguered pact in the funny pages - and Democrats are counterattacking via cartoon.

"This past Sunday, in the comics section of papers nationwide (including the Post), was an insert called the Mini Page that explained trade at a children's level," Assistant U.S. Trade Representative Sean Spicer said in an e-mail sent to reporters Wednesday, adding that the fourth page of the insert included “an explanation of why the Colombia trade agreement is in the best interest of American workers."

President Bush has been a staunch supporter of trade with Colombia.

"Colombia is one of our strongest allies in the Western Hemisphere. They are led by a very strong and courageous leader, President Uribe. He's taken courageous stands to defend our shared democratic values," he said last month.

"Thank you for your helpful (if somewhat condescending) explanation of trade 'at a children's level,'" he wrote in an e-mail.

"I wanted to bring to your attention a series known as Schoolhouse Rock! Between 1973 and 1986 a series of fifty-two educational short films featuring songs about schoolhouse topics” – adding that the cartoon short "I'm Just a Bill" had "dealt extensively with the legislative process - at a children's level."

"If you find 'I'm Just a Bill' helpful, you may also want to check out 'Three Ring Government' which explains the three co-equal branches of the federal government and discusses the concept of separation of powers," wrote Shoemaker.

House Speaker Nancy Pelosi has said she would not bring the Columbia free trade legislation up for a vote.